Fleets in the U.K. are saving fuel by using fuel cards, increasing the number of lower CO2/high-mpg vehicles, encouraging drivers to fill up at supermarket pumps, checking tire pressures and providing drivers with tips on driving more fuel efficiently. Some U.K. fleet operators are taking a more proactive approach than others. Choosing vehicles with improved fuel efficiency is the easiest step. Fuel cards monitor the figures drivers are achieving and highlight which might be costing the company more money while also helping to prevent fuel fraud. Drivers are encouraged to check their tire pressure as under-inflated tires increase fuel consumption by 4%.